matthews



`(magi.) A l n sheets-Sheng J. B.,MAT`TIIIEWS. Feed'Motionfor MetalPlan-ing Machines.

No. 239'969` Patented April 12,188.1.

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' LBMATTHEWE (f. QJ by Attorney.

Y UNITED STATES PATENT OFFICE.

JOSEPH E. MATTHEWS, OE BALTIMORE, MD., AssIeNOE OE ONEHALE To EETTsMAOHINE COMPANY, OE WILMINGTON, DEL.

FEED-MOTIONl FOR METAL-PLANING MACHINES.

SPECIFICATION forming part of Letters Patent No. 239,969, dated April12, 1881.

Application tiled November 24, 1880. (Model.) l

To all whom it may concern: Be it known that I, JOSEPH B. MATTHEws, ofBaltimore city, State of Maryland, have invented certain new and usefulImprovements in Feed-Motions for Metal-Planin g Machines; and I herebydeclare the same to be fully, clearly, and eXactly described asfollows,ref erence being had to the accompanying drawings, in which- 1oFigure l is an elevation of a device embodying my present invention, thecovering gearwheel being removed. Fig. 2 is a similar view of thelatter. Fig. 3 is a side elevation of the device complete. Fig. et is anenlarged view of the reversin'g-pawl; and Fig. 5 is a sectional view ofthe tip of the latter.

Myinvention relates, in general, to machines for planing metal, and, inparticular, to that portion of the machine constituting the dezo vicesfor `feeding the cutter vertically and laterally, and for lifting itspoint clear of the work pending the return-stroke of the latter.

My invention is applicable to planing-ma chines of the usual or ordinaryconstruction, in

view of which fact I have considered it unnecessary to illustrate in theaccompanying drawings, and shall not particularly describe,

the construction and arrangement of those` portions of the planer notgermane to my in- 3o vention and constituting no part of the same.

Suffice it that they embody a bed-plate arranged to carry the work andto reciprocate beneath the cutter, which latter is arranged in guidessusceptible of lateral and vertical motions with reference to thebed-plate.

The cutter is fed by the usual screw, ratchet, segment'rack, andpitman-rod, and the bed plate isactuated by a gear-wheel mounted on atransverse shaft beneath the machine. The

4o mechanism for reversing the motion of the bed-plate or table andshifting the belt may be of any desired and suitable construction.

Proceeding to describe those portions of the machine germane to mypresentinvention and illustrated in the accompanying drawings, but

which portions are of the usual or well-known constructions, N is a diskmounted on the end of the shaft C, and having a dovetail groove on itsface, in which is mounted a screw-rod 5o actuated by a crank, u; A blockpivoted on the end of the pitman-rod is mounted upon this screwrod andslides in the dovetail groove.

rlhe throw of the rod, as the disk is turned, is regulated by the crankn, being, of course, measured by the radial distance lof the block fromthe center of the disk. O is a crank having a terminal groove for thecord, which lifts the cutter-point pending the return-stroke ot' thebed-plate.

Before describing the parts of the machine 6o embodying my invention theobject of the lat ter may be concisely stated, as follows: Itis designedto furnish a mechanism for positively driving the shaft C, whichcommunicates motion to the feed device, but which mechanism 65 shall beso constructed as to automatically yield before the end of the strokeot' the disk is reached, or upon the interposition at any point in-t-hefeed machinery of an obstacle. Upon the happening of this contingencythe 7o pawl constituting the positive feed-mover automatically reverseswithout strain or injury to the machine or to the obstacle-a point ot'the highest importance in View Ot' the fact that the latter is liable tobe the hand of the opera' 75 tor, which is sometimes caught between thesegment-rack and its pinion.

A is a casing having a sleeve, a', in which the shaft O turns, whichcasing is secured to the main frame of the machine, near the trans- 8overse shaft, by bolts passing through holes a.. O11 the shaft (l turnsfreelythe wheel H, which is hollow, as shown in Fig. 2, and is providedwith a central sleeve, c', and with external teeth', M, that mesh withthose of a gear-wheel 8 5 on the transverse shaft, beneath thebed-plate, and with an internal series of shallow teeth, J, which latterconstitute the'ratchet.

D is a plate which, together with the wheel H, constitutes a box, as itwere, containing the 9o pawl mechanism. The parts D and H are se# curedtogether by screws passingthrough the holes d Z.

A bar or arm, c,` is secured to the shaft C, and has arms e e, betweenwhich slides the block E, that is mounted on the end of a rod,

g. This latter passes through the shaft C and is normally thrust outwardby means of a spring, G. A lug or set screw, F, passes through one ofthe arms e and enters a slot, f, roo

in the block E, limiting the motion ofthe latter. One inner edge of theblock E is beveled, as shown at 0, (see Fig. 4,) and against thisbeveled portion a pin,`fm, is caused to press by means of a spring, L.

In the end of the block E is pivoted the re- I versible pawlh, which isperforated near its tip, and in the perforation are a pair of pins, it,that are normally thrust outward by mea-ns of a spring, t. The pawl issusceptible of a motion,substantiallyinthearczaboutitspivot, somewhatless than through a half-circle, the motion of the pawl about its pivotbeing, in a Word, less than sufficient to bring the path y y describedby the pins t' into coincidence with the path m w described. by thepivot as the arm c turns, and less than sufficient to bring the axis wu" of the pawl to a position at right angles to the axis of the rod g.The angle between the line w tu and the axis of the rod g should beabout seventy degrees. On the casing A are a pair of stops, b, againstwhich the arm c abuts at the end of its stroke, and which permit the armto turn through about a half-circle.

Such is the construction of the device.

In operation the wheel H is driven by the gear-wheel on tbe main shaftof the machine, the motion of which is reversed in the usual way. Asthis reversal of motion occurs the pawl h engages with the ratchet J,and the shaft G is caused to turn, carrying With it the disk N andeffecting the throw of the pitmanrod, as will be readily understood.When the arm c brings up against thestop b the further motion of thewheel H simply represses the pawl-rod g, and tilts the pawl over inposition for engagement with the ratchet on the returnstroke.

Theobject of the pins@ is twofold: being caused by means of the springt" to press outward against the sides of the wheel H and the plate D,the slight friction thereby caused results in a traction upon thepawl-tip in a line tangent to the arc y y', whereby the pawl is held outof contact with the ratchet, and the noise and clicking which wouldotherwise result are avoided.

As the motion of the wheel H is reversed the frictional contact of thepins with the wheel and plate D, acting in connection with the weight ofthe pawl, quickly swings the pawl into engagement with the ratchet. Theresistance to the repression of Vthe rod g incident upon the an gularityof the thrust with the axis ofthe rod and upon the resistance of thesp1-in g G, is supplemented in an important manner by the pin m andincline o.

These elements serve to resist the inception of the `repression of therod and hold the pawl with practical rigidity, while still offering nomaterial resistance after the motion is once started. The immenseadvantages of the device over the old frictional feed-motions are atonce evident. The latter are uncertain in their operation, are liable,upon the entrance of a little oil, to refuse to work at all, requireconstant adjustment, and are, in effect, no positive motions at all.

The present device is simple, not liable to get out of order, is readilyapplicable to planers already in use, and, while affording a positivefeed, is yet of such construction that should the hand of the operatorbe caught, as so frequently occurs in the feed machinery, the partsyield by the tilting of the pawl, and no injury results to eithermachine or operator.

What I claim as new, and desire to secure- "by Letters Patent, is- Yment with the ratchet until the motion of the.

wheel is reversed,I as set forth.

3. In a feed-motion for planing-machines, the combination, with thedriving-wheel and ratchet, of the reversible pawl havingfrictionretractible rod and adapted to tilt, as set forth.

5. in combination With the driven wheeland ratchet, a reversible pawlpivoted upon a block having a bevel, o, and spring, m, whereby theinception of the stroke necessary to reverse the pawl is resisted, asset forth.

6. ln combination with the driven wheel and ratchet, the pawl pivotedupon the block E, having bevel o, pin m, slotf, and lug F, as set forth.

7. 1n combination with the driven Wheel having ratchet, the reversiblepawl h, rod g, and spring Gr, as set forth.

8. The casing A, having stops b, and sleet'e af, in combination with theshaft C, arm c, reversible pawl, and disk N, as set forth.

9. In combination with the casing, having stops b and sleeve a', theshaft G, arm c, rod g, spring G, and reversible pawl h, as set forth.

JOSEPH B. MATTHEWS.

Witnesses:

It. D. WILLIAMS, JOHN C. GITTINGER.

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